A direction perpendicular to this initial direction

Reference no: EM13531798

A billiard ball will stop short when it collides head-on with a ball at rest. The ball cannot stop short, however, if the collision is not exactly head-on-that is, if the second ball moves at an angle to the path of the first. Do you know why? (Hint: Consider momentum before and after the collision along the initial direction of the first ball and also in a direction perpendicular to this initial direction.)

Reference no: EM13531798

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